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Cellular Fuel Source Utilization

Meaning

Cellular fuel source utilization describes the fundamental physiological process by which individual cells select, metabolize, and derive energy from available macronutrients, primarily glucose, fatty acids, and to a lesser extent, amino acids. It encompasses the intricate metabolic flexibility required for cells to seamlessly switch between these substrates based on the body’s immediate hormonal signals and energy demands. The efficiency and flexibility of this utilization are direct and measurable indicators of metabolic health and cellular longevity, influencing tissue function across the body.